Erik Ernst 88037f0a64 Added compile-time errors for supertypes: Type alias missing, and more. ...

R=lrn@google.com

Review-Url: https://codereview.chromium.org/2585723002 .

2016-12-16 14:02:56 +01:00

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Added compile-time errors for supertypes: Type alias missing, and more.

2016-12-16 14:02:56 +01:00